JP4136869B2 - Welded joint construction and welded joint structure of steel columns capable of energy absorption - Google Patents

Description

  The present invention belongs to a technical field of a welded joint construction method and a welded joint structure by metal touch of a steel column of a steel structure building. More specifically, the present invention uses an energy absorbing member (damper plate), and the building is horizontal due to an earthquake or wind. Steel column welded joint structure and welded joint structure capable of absorbing energy so as to reduce the response by absorbing the tensile stress with the energy absorbing member while resisting axial compression force and shearing force when subjected to force About.

  Conventionally, there are many methods of manufacturing a column joint portion of a steel structure building with about three layers as one section. As the joint construction method, a rigid joint by welding, high-strength bolt friction, or the like is used.

  For example, in Patent Document 1, “Rectangular Steel Tubular Columns Rigidly Connected Structures”, a backing plate is applied to each of the front and back surfaces of the joint portion across the upper and lower rectangular steel tube columns, and rigidly joined by one-side bolts with a special structure. A configuration is disclosed. This is classified as a kind of the above high strength bolt friction joint.

  The "joint structure of upper and lower steel columns" in Patent Document 2 is a structure in which a joint metal is interposed between the upper and lower steel columns and is firmly joined by welding joint between the upper and lower steel columns and the joint metal or high-strength bolt friction joint Is disclosed.

  As a technique generally referred to as a flange joint, the “joint structure of a steel pipe column” in Patent Document 3 is provided with a flange in advance at the end of the upper pipe connected as a column, and its outer peripheral surface is halved. A flange joint is disclosed which is sandwiched between hardware and tightened firmly by a sleeve.

  As an example in which an energy absorbing member is attached to a main structural member of a building, a “column beam joint structure” in Patent Document 4 discloses a configuration in which a cover plate is attached to a flange of an H-shaped steel beam end. By attaching a plate or cover plate made of triangular plate-like ultra-low yield point steel (energy absorbing member) horizontally on both the left and right sides of the flange of the H-shaped steel beam and welding it to the column, the H-shaped steel beam A structure is disclosed in which the joint portion is strengthened, the deformation following performance of the H-shaped steel beam at the time of an earthquake is improved, and the H-shaped steel beam absorbs the hysteresis energy at the time of the earthquake together with the plate or the cover plate.

  Further, the “column joint having an energy absorbing member” of Japanese Patent Application No. 2002-86353 by the present applicant is, for example, as shown in FIG. 11, standing vertically upward on the upper surface of the diaphragm 111 on the upper side of the lower steel column 110. The upper steel column 113 is inserted inside the energy absorbing member 112 (damper plate) whose lower end is welded to the diaphragm 111, and the upper steel column 113 and the diaphragm 111 are brought into contact with each other (metal touch). ing. The upper part of the energy absorbing member 112 (damper plate) is tightly coupled to the upper steel column 113 by welding.

Japanese Patent No. 2702882 Japanese Examined Patent Publication No. 7-81314 JP-A-8-144384 JP 2000-273971 A

  Rigid joints and flange joints such as weld joints and high-strength bolt friction joints disclosed in Patent Documents 1 to 3 can tightly bond between columns. However, there is a problem that almost no energy can be absorbed with respect to the stress generated in the column joint due to an earthquake or wind.

  The invention disclosed in Patent Document 4 has a configuration in which the energy absorbing member is attached to the H-shaped steel beam, and the stress generated in the column joint portion cannot be reduced.

  In the invention of Japanese Patent Application No. 2002-86353, the lower end of the upper steel column 113 is placed on the upper surface of the diaphragm 111 in a metal touch state. As shown in an enlarged view in FIG. 11, the energy absorbing member 112 (damper plate) is attached to the diaphragm. It is very difficult to construct so that the weld bead protrudes greatly when welded completely with 111, and if it protrudes, it will be necessary to grind it and it will be difficult to achieve a complete metal touch of the upper steel column 113 There is a problem. Further, when the lower end of the energy absorbing member 112 is welded and joined to the upper surface of the diaphragm 111, it is difficult to accurately maintain the joining position and vertical posture of the energy absorbing member 112, and the welding work is troublesome and it is difficult to obtain accuracy.

  In short, the object of the present invention is to solve the problems of the invention according to Japanese Patent Application No. 2002-86353, that is, the weld bead between the lower end of the energy absorbing member (damper plate) and the diaphragm is an obstacle to metal touch. Furthermore, the present invention provides a steel column welded joint construction method and welded joint structure that improve the welding quality, and improve the construction of the joining position and vertical posture of the energy absorbing member so that the accuracy and precision can be easily obtained. It is in.

  It is another object of the present invention to provide a welded joint construction method and welded joint structure using a shear resistance member that also serves as a positioning function so that the cross sections of the upper and lower steel columns used as a metal touch do not conflict.

As means for solving the above-described problems, a welded joint construction method for a steel column capable of absorbing energy according to the invention described in claim 1 is:
In the welded joint construction method by the metal touch of the steel pipe column of the steel structure building,
A short intermediate steel pipe 4 is arranged at the center position of the column on the upper surface of the column base diaphragm 3, and a plurality of damper plates 5 for absorbing energy made of steel material are set up vertically on the outer periphery. The damper plate 5 and the diaphragm 3 are A process in which complete penetration welding is performed, and the intermediate steel pipe 4 and the diaphragm 3 are also welded and joined,
Inserting the upper steel pipe column 6 into the inside of the damper plate 5 and placing the lower end of the upper steel pipe column 6 on the upper end of the intermediate steel pipe in a metal touch state, and bonding the upper portion of each damper plate 5 to the upper steel pipe column 6 by welding; It is characterized by comprising.

The invention described in claim 2 is a welded joint construction method for a steel column capable of absorbing energy according to claim 1,
The shear resistance member 8 rising vertically along the inner peripheral surface of the intermediate steel pipe 4 is protruded higher than the upper end surface of the intermediate steel pipe 4, and the shear resistance member 8 is welded to the inner peripheral surface of the intermediate steel pipe 4 and the diaphragm 3. The upper steel pipe column 6 is inserted between the damper plate 5 and the shear resistance member 8 and the lower end thereof is placed on the intermediate steel pipe 4 in a metal touch state.

Invention of Claim 3 in the welded joint construction method of the steel column in which the energy absorption as described in Claim 1 or 2 is possible,
The intermediate steel pipe 4 is manufactured by cutting the lower end portion of the upper steel pipe column 6 to a required length, at least a length T equal to or greater than the thickness L of the slab 7, with the cut surface facing upward on the upper surface of the diaphragm 3. It is characterized by installing.

Invention of Claim 4 in the welded joint construction method of the steel column in which the energy absorption as described in any one of Claims 1-3 is possible,
An annular tie band 9 that surrounds the outer periphery of each damper plate 5 located on the outer peripheral surface of the intermediate steel pipe 4 is set in a temporarily fixed state, and each damper plate 5 is tightened and restrained. The upper part is tightly connected to the upper steel pipe column 6 by welding.

The welded joint structure of a steel column capable of absorbing energy according to the invention described in claim 5 is:
It is a welded joint structure by metal touch of a steel column of a steel structure building,
A short intermediate steel pipe 4 is arranged at the center of the column on the upper surface of the column base diaphragm 3, and a plurality of damper plates 5 made of steel are erected vertically upward on the outer periphery, and the damper plate 5 and the diaphragm 3 are completely melt welded. The welded steel pipe 4 and the diaphragm 3 are also welded together,
The upper steel pipe column 6 is inserted into the inside of the damper plate 5 and the lower end thereof is placed in a metal touch state on the upper end of the intermediate steel tube 4, and the upper portion of each damper plate 5 is fastened to the upper steel pipe column 6 by welding. It is characterized by.

The welded joint structure of a steel column capable of absorbing energy according to the invention described in claim 6 is:
It is a welded joint structure by metal touch of a steel column of a steel structure building,
A short intermediate steel member 40 having the same shape and the same size as the steel column made of H-shaped steel is disposed at the center of the column on the upper surface of the diaphragm 30 of the steel column base, and a damper plate 50a made of steel is formed on the outer peripheral surface of the flange and web. , 50b stands vertically upward, the damper plates 50a, 50b and the diaphragm 30 are completely melt-welded, and the intermediate steel member 40 and the diaphragm 30 are also welded together.
The upper steel column made of H-shaped steel is inserted inside the damper plates 50a and 50b and the lower ends thereof are placed in a metal touch state on the upper ends of the intermediate steel members 40, and the upper portions of the damper plates 50a and 50b are upper. The steel column 60 is tightly connected by welding.

According to the welded joint construction method and welded joint structure of a steel column capable of absorbing energy according to the inventions described in claims 1 to 6, the intermediate steel pipe between the diaphragm and the upper steel pipe column or the steel column made of H-shaped steel Or, because the intermediate steel material is interposed, the weld bead between the lower end of the damper plate and the diaphragm does not interfere with the metal touch, and the intermediate steel pipe serves as a backing metal when welding the damper plate. It also acts as a gauge and contributes to improving the accuracy and precision of the damper plate joining position and vertical posture.
As in claim 3, when the intermediate steel pipe or the intermediate steel material is obtained by cutting the lower end portion of the upper steel pipe column or the steel column made of H-shaped steel, the accuracy of the consistency of the metal touch surface can be obtained with certainty. . Furthermore, if the length of the intermediate steel pipe or the intermediate steel material is set to a length (height) greater than the thickness of the slab, the concrete slab placing process is not affected.
As in claim 2, when the shear resistance member is projected like a dowel on the metal touch surface of a steel pipe column or steel column, the horizontal force or the column material axis around the column cross-section is placed in a metal touch state. It also serves as a positioning function that does not cause discrepancies or play due to torsional force, and can efficiently perform the construction work of the upper and lower steel pipe columns or steel columns made of H-shaped steel. Moreover, resistance to the shearing external force is increased, and the load on the shearing of the damper can be reduced. On the other hand, the damper plate resists the tensile stress at the time of earthquake, and the energy is absorbed by the plastic deformation, and the seismic control effect that reduces the seismic response is obtained.

A short intermediate steel pipe 4 is arranged in the center of the column on the upper surface of the column base diaphragm 3, and a plurality of damper plates 5 made of steel are set vertically upward on the outer periphery, and the damper plate 5 and the diaphragm 3 are completely melt welded. The intermediate steel pipe 4 and the diaphragm 3 are also welded.
The upper steel pipe column 6 is inserted into the damper plate 5 and the lower end thereof is placed on the upper end of the intermediate steel tube 4 in a metal touch state, and the upper portion of each damper plate 5 is fastened to the upper steel pipe column 6 by welding.
The shear resistance member 8 rising vertically along the inner peripheral surface of the intermediate steel pipe 4 is protruded higher than the upper end surface of the intermediate steel pipe 4, and the shear resistance member 8 is connected to the inner peripheral surface of the intermediate steel pipe 4 and / or the diaphragm 3. The upper steel pipe column 6 is inserted between the damper plate 5 and the shear resistance member 8 and the lower end thereof is placed on the intermediate steel pipe 4 in a metal touch state.
The intermediate steel pipe 4 is manufactured by cutting the lower end of the upper steel pipe column 6 to a required length, at least a length T equal to or greater than the thickness L of the slab, and installed on the upper surface of the diaphragm 3 with the cut surface facing upward. To do.

  FIGS. 1-8 has shown the principal of the construction procedure of the welded joint construction method and welded joint structure based on the invention described in Claims 1-5 in order. First, FIG. 1 is provided with upper and lower (column base and column head) diaphragms 3 and 3 in an arrangement matching the flange of the steel beam 2 at the beam joint position at the upper end of the lower steel pipe column 1 rising from below. The steel beam 2 is joined to each of them. And it is joined to the diaphragm 3 by welding. A short intermediate steel pipe 4 is arranged at the center of the column on the upper surface of the diaphragm 3 of the column base, and then a plurality of energy absorbing damper plates 5 made of steel stands vertically upward on the outer peripheral surface of the intermediate steel pipe 4. It shows a stage in which the lower end portion of the damper plate 5 and the upper surface of the diaphragm 3 are brought into close contact with the outer peripheral surface of the intermediate steel pipe 4 by complete penetration welding. As shown in the enlarged view of FIG. 1, the intermediate steel pipe 4 serves as a backing metal when the damper plate 5 is welded, and also exhibits an action and effect as a so-called gauge for positioning the damper plate 5. Therefore, the accuracy and accuracy of the joining position and vertical posture of the damper plate 5 can be improved.

  FIG. 1 also shows that the shear resistance member 8 rising vertically along the inner peripheral surface of the intermediate steel pipe 4 protrudes sufficiently from the upper end surface of the intermediate steel pipe 4, and the shear resistance member 8 is Also shown is a state where the diaphragm 3) and the diaphragm 3) are firmly joined by welding or the like.

  The intermediate steel pipe 4 is a column body for realizing the addition of the upper steel pipe column 6 by metal touch. Preferably, the lower end portion of the upper steel pipe column 6 has a required length, specifically, at least the lower steel pipe. The concrete slab 7 to be cast on the pillar 1 is cut into a length (height) T equal to or greater than the thickness L, and is installed on the upper surface of the diaphragm 3 with its cut surface facing upward. Then, the cut surface shapes of the intermediate steel pipe 4 and the upper steel pipe column 6 become substantially the same shape, and the accuracy of the consistency of the metal touch surface can be reliably obtained. In particular, as shown in FIG. 2, it is suitable when the cut section is implemented in a shape that can withstand the horizontal force, such as a wave shape, a mountain-valley shape, a rectangular wave shape, or the like. Of course, the intermediate steel pipe 4 can be made by other methods. Further, the fact that the intermediate steel pipe 4 has a length (height) T equal to or greater than the thickness L of the slab 7 means that the welding operation of the upper steel pipe column 6 and the damper plate 5 is possible even when the slab 7 is driven. The slab 7 placement process is not affected.

  Next, FIG. 3 shows that the upper steel pipe column 6 is inserted between the damper plate 5 and the shear resistance member 8 from the state of FIG. 1 and the lower end thereof is placed on the intermediate steel pipe 4 in a metal touch state. The upper part of each damper plate 5 ... is shown in a stage where the upper steel pipe column 6 is joined by welding.

  FIG. 4 shows a state in which an annular tie band 9 that surrounds the outer periphery of each damper plate 5 is arranged on the upper surface of the diaphragm 3 after the completion of the fastening of each damper plate 5 as shown in FIG. 3 (FIG. 4A). Temporarily fix 5 to restrain. After the upper part of each damper plate 5 is tightly connected to the upper steel pipe column 6 by welding, the tie band 9 is placed at an appropriate position for restraining each damper plate 5 and tightened to restrain the main plate (FIG. B) (Invention of claim 4).

5A and 5B show different configuration examples of the tie band 9.
FIG. 5A shows a case where the upper steel pipe column 6 and the intermediate steel pipe 4 have a circular cross section, and of course, the damper plate 5 also has an arc shape. The tie band 9 is an example of a configuration in which a pair of bands 9a and 9b equal to a circle divided into two in the diameter line direction are combined, and end plates at both ends are coupled and tightened by a fastening mechanism 10 using bolts and nuts. Show.

  FIG. 5B shows a case where the upper steel pipe column 6 and the intermediate steel pipe 4 have a square cross section, and the damper plate 5 has a flat plate shape along four sides. The tie band 9 is an example of a configuration in which a pair of bands 9a and 9b equal to a quadrilateral divided into two in a diagonal direction are combined, and end plates at both ends are coupled and tightened by a fastening mechanism 10 using bolts and nuts. ing.

  As described above, when the outer peripheral surface of the damper plate 5 is wound and restrained by the tie band 9, it is possible not only to prevent horizontal displacement of the metal touch surface but also to restrain out-of-plane deformation of the damper plate 5. It becomes.

By the way, in the construction of a steel structure building having a middle layer or higher, a steel column is generally manufactured with about three layers as one section. FIG. 6 shows an embodiment in such a case.
That is, the dotted circles 11 and 12 in FIG. 6 have the above-described configuration, and the upper and lower steel pipe columns 1 and 6 are previously joined together by welding using a damper plate 5 for energy absorption in a factory or the like. At the joining point of the dotted circle 13, the intermediate steel pipe 4 and the damper plate 5 are welded and joined to the upper diaphragm 3 of the lower steel pipe column 1 in advance at the factory, and the outer peripheral surface is tightened with the tie band 9. Stabilize and carry on site.

Next, FIGS. 7 and 8 show examples of different configurations of the shear resistance member 8.
First, the shear resistance member 8a shown in FIGS. 7A and 7B is equivalent to the four corners of the cross section of the steel pipe 4 in the cross section, preceded by four shear resistance members 8a manufactured by cutting a steel material having a square section into a required length. It arrange | positions so that it may protrude in a diagonal direction to the position of this, and the upper end surface of the said relay steel material 4 higher, and the lower end part is welded to the diaphragm 3 of a column base all around. The joint steel pipe 4 inserted after that and welded all around the diaphragm 3 is also tightly bonded so that the horizontal force can be shared by continuously welding the respective contacts of the shear resistance member 8a. Of course, it is also possible to carry out by a joining means other than welding.

  8A and 8B, a shear resistance member 8b shown in FIGS. 8A and 8B is a square steel pipe (or a steel pipe column having a diameter inscribed in the inner circumference of the intermediate steel pipe 4 after the intermediate steel pipe 4 is first welded to the diaphragm 3 in advance. 6) can be cut to the required length, and further divided into 4 parts vertically (if there is a steel pipe that can be inscribed, it can be left as it is), and from the inner width of the intermediate steel pipe 4 The shear resistance material 8b whose cutting allowance is determined to be small is incorporated into the intermediate steel pipe 4 and assembled again into a quadrangle, and the vertical dividing lines are continuously welded to each other to complete a single square pipe again. Thus, it is configured to resist horizontal force. Of course, it is the arrangement | positioning protruded higher than the upper end surface of the relay steel material 4 similarly to FIG. If necessary, the lower end of the shear resistance member 8b is welded to the diaphragm 3 of the column base.

9 and 10 show a second embodiment of the welded joint construction method and welded joint structure of a steel column capable of absorbing energy according to the invention described in claim 6.
This embodiment is a welded joint construction method and welded joint structure substantially the same as the embodiment according to claims 1 to 5 described above, but shows an embodiment suitable for an H-shaped open section material as a steel column. Hereinafter, only differences will be described, and description of all symbols will be omitted.

  Compared with the embodiment according to FIGS. 1 to 8 described above, the present example has a steel column made of H-shaped steel at the center position of the column on the upper surface of the diaphragm 30 of the steel column base, as shown in FIG. A short intermediate steel material 40 of the same shape and the same size is disposed, and energy absorbing damper plates 50a and 50b made of steel materials are closely applied to the intermediate steel material 40 vertically upwardly to the outer periphery of the flange and the web, respectively. , 50b, the lower end portion of the diaphragm 3 and the upper surface of the diaphragm 3 are completely welded together by welding.

  Further, as shown in FIG. 10, an angle member is used as the shear resistance member 80 rising vertically along the inner wall surface of the intermediate steel member 40, and the positions corresponding to the four corners of the intermediate steel member 40 and the web damper plate 50b are obstructed. In such an arrangement, the lower end of the shearing member 80 is continuously welded to the inner wall surface of the intermediate steel pipe 40 that is welded to the diaphragm 30 at its lower end and is welded to the diaphragm 30. The shear resistance member 80 may be a channel or the like. If the damper plate 50b of the energy absorbing web has sufficient accuracy that the shear resistance can be sufficiently expected, the shear resistance member 80 can be implemented even if not necessary.

It is the elevation which showed the stage just before the construction of the welded joint of the steel pipe column which can absorb energy concerning the present invention. It is the elevation which showed the example of a different structure of a joint steel pipe. It is an elevation view which shows the completion stage of the welded joint of the steel pipe column which can absorb energy based on this invention. It is the elevation which was provided so that the steel tie band might be surrounded to the junction location of a column joint. A and B are plan views showing different configuration examples of tie bands. It is the elevation which showed the Example of this invention about the steel frame pillar of 3 layers 1 node. A and B are the top view and elevation which showed the example of a different structure of a shear resistance member. A and B are the top view and elevation which showed the example of a different structure of a shear resistance member. It is an elevational view of a second embodiment of a welded joint of steel pipe columns capable of absorbing energy according to the present invention. It is the top view which showed the structural example of the shear resistance member of 2nd Example. It is the elevation which showed the Example of the coupling of the conventional steel pipe pillar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper steel pipe column 10 Upper steel column which consists of H-shaped steel 3, 30 Diaphragm 4 Intermediate steel pipe 40 Intermediate steel material 5, 50a, 50b Damper plate
6 Upper steel pipe column 60 Lower steel column of H-shaped steel 7, 70 Slab 8, 80 Shear resistance member 9, 90 Tie band L, l Thickness of slab T, t Length of intermediate steel pipe

Claims (6)

In the welded joint construction method by metal touch of the steel column of the steel structure building,
A short intermediate steel pipe is placed at the center of the column on the top of the column base diaphragm, and a plurality of damper plates made of steel for energy absorption are placed vertically upward on the outer circumference, and the damper plate and the diaphragm are completely melt welded. , The process of welding and joining the steel pipe and diaphragm,
The upper steel pipe column is inserted into the inside of the damper plate, the lower end thereof is placed in a metal touch state on the upper end of the intermediate steel tube, and the upper portion of each damper plate is joined to the upper steel pipe column by welding. A welded joint construction method for steel columns that can absorb energy.   The shear resistance member that rises vertically along the inner peripheral surface of the intermediate steel pipe protrudes higher than the upper end surface of the intermediate steel pipe, and the shear resistance member is installed by welding to the inner peripheral surface or diaphragm of the intermediate steel pipe. 2. The energy absorption according to claim 1, further comprising a step of inserting the lower end of the steel pipe column between the damper plate and the shear resistance member and placing the lower end of the steel pipe column on the intermediate steel pipe in a metal touch state. Possible steel column welded joint construction method.   The spliced steel pipe is manufactured by cutting the lower end of the upper steel pipe column to the required length, at least the length of the slab thickness, and installing it on the upper surface of the diaphragm with the cut surface facing upward The welded joint construction method for steel columns capable of absorbing energy according to claim 1 or 2, characterized in that.   An annular tie band that surrounds the outer periphery of each damper plate located on the outer peripheral surface of the intermediate steel pipe is temporarily installed, and the upper part of each damper plate is fastened to the upper steel column by welding. The welding joint construction method for a steel column capable of energy absorption according to any one of claims 1 to 3, further comprising a step of tightening and restraining the plate. It is a welded joint structure by metal touch of a steel column of a steel structure building,
A short intermediate steel pipe is placed at the center of the column on the upper surface of the column base diaphragm, and a plurality of damper plates made of steel are erected vertically upward on the outer periphery, and the damper plate and the diaphragm are completely melt welded. The steel pipe and diaphragm are also welded together,
The upper steel pipe column is inserted into the inside of the damper plate and the lower end thereof is placed on the upper end of the intermediate steel pipe in a metal touch state, and the upper part of each damper plate is tightly connected to the upper steel pipe column by welding. And a steel column welded joint structure capable of absorbing energy. It is a welded joint structure by metal touch of a steel column of a steel structure building,
A short intermediate steel material of the same shape and size as the steel column made of H-shaped steel is arranged at the center of the column on the upper surface of the diaphragm of the steel column base, and the damper plate made of steel is vertically upward on the outer peripheral surface of the flange and web Each of the damper plates and the diaphragm are completely melted and welded, and the intermediate steel material and the diaphragm are also welded,
The upper steel column made of H-shaped steel is inserted into the inside of each damper plate and its lower end is placed in the metal touch state on the upper end of the intermediate steel material, and the upper portion of each damper plate is tightly connected to the upper steel column by welding. A welded joint structure of steel columns capable of absorbing energy, characterized in that

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